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Commit e5f8d1f0 authored by Greg Ungerer's avatar Greg Ungerer
Browse files

m68k: move CONFIG_FPU set to per-CPU configuration 



Move the selection of CONFIG_FPU to each CPU type configuration.

Currently for m68k we have a global set of CONFIG_FPU based on if CONFIG_MMU
is enabled or not. There is at least one CPU family we support (m5441x)
that has an MMU but has no FPU hardware. So we need to be able to have
CONFIG_MMU set and CONFIG_FPU not set.

Whether we build for a CPU with MMU enabled or not doesn't change the
fact that it has FPU hardware support. Our current non-MMU builds have
never had CONIG_FPU enabled - and in fact the kernel will not compile
with that set and CONFIG_MMU not set at the moment. It is easy enough
to fix this - but it would involve a structure change to sigcontext.h,
and that is a user space exported header (so ABI change).

This change makes no configuration visible changes, and all configs
end up with the same configuration settings as before.

This change based on changes and discussion from Yannick Gicquel
<yannick.gicquel@open.eurogiciel.org>.

Signed-off-by: default avatarGreg Ungerer <gerg@linux-m68k.org>
parent 36d050d9

arch/m68k/Kconfig

+0 −1
Original line number Diff line number Diff line
@@ -14,7 +14,6 @@ config M68K 
	select GENERIC_IOMAP

	select GENERIC_STRNCPY_FROM_USER if MMU

	select GENERIC_STRNLEN_USER if MMU

	select FPU if MMU

	select ARCH_WANT_IPC_PARSE_VERSION

	select ARCH_USES_GETTIMEOFFSET if MMU && !COLDFIRE

	select HAVE_FUTEX_CMPXCHG if MMU && FUTEX

arch/m68k/Kconfig.cpu

+6 −0
Original line number Diff line number Diff line
@@ -62,6 +62,7 @@ config MCPU32 
config M68020

	bool "68020 support"

	depends on MMU

	select FPU

	select CPU_HAS_ADDRESS_SPACES

	help

	  If you anticipate running this kernel on a computer with a MC68020
@@ -72,6 +73,7 @@ config M68020 
config M68030

	bool "68030 support"

	depends on MMU && !MMU_SUN3

	select FPU

	select CPU_HAS_ADDRESS_SPACES

	help

	  If you anticipate running this kernel on a computer with a MC68030
@@ -81,6 +83,7 @@ config M68030 
config M68040

	bool "68040 support"

	depends on MMU && !MMU_SUN3

	select FPU

	select CPU_HAS_ADDRESS_SPACES

	help

	  If you anticipate running this kernel on a computer with a MC68LC040
@@ -91,6 +94,7 @@ config M68040 
config M68060

	bool "68060 support"

	depends on MMU && !MMU_SUN3

	select FPU

	select CPU_HAS_ADDRESS_SPACES

	help

	  If you anticipate running this kernel on a computer with a MC68060
@@ -259,6 +263,7 @@ config M547x 
	bool "MCF547x"

	select M54xx

	select MMU_COLDFIRE if MMU

	select FPU if MMU

	select HAVE_CACHE_CB

	select HAVE_MBAR

	select CPU_NO_EFFICIENT_FFS
@@ -268,6 +273,7 @@ config M547x 
config M548x

	bool "MCF548x"

	select MMU_COLDFIRE if MMU

	select FPU if MMU

	select M54xx

	select HAVE_CACHE_CB

	select HAVE_MBAR